Effects of Main Nutrients on the Growth and Development of Ornamental Plants The major nutrients necessary for the normal growth of plants are carbon, hydrogen, oxygen, nitrogen, phosphorus, potassium, calcium, magnesium and sulfur. It accounts for more than 93% of the dry weight of plants; Trace elements include iron, manganese, boron, copper, zinc, molybdenum and chlorine. It only accounts for one millionth to one hundreds of thousands of the dry weight of plants. Among them, hydrogen and oxygen come from water and carbon comes from the atmosphere. These three elements can be supplemented by irrigation and carbon dioxide fertilization. Nitrogen comes from the atmosphere, is fixed in the soil by nitrogen-fixing organisms, and then is absorbed by plants together with all other mineral elements in the soil. Usually plants need a lot of nitrogen, but the nitrogen in the soil is limited, so nitrogen fertilizer is needed. Whether to supplement other elements depends on the needs of plants, the quantity and availability of soil, and is affected by soil properties and water quality. Except sandy alkaline earth and hydroponic soil, there are trace elements in the soil generally, and there is no need to supplement them. Analysis of plant nutrient content is helpful to understand the absorption, utilization and distribution of different nutrients by plants, and can be used as a reference for fertilization standards. Cut flowers such as chrysanthemums, carnations, roses and violets. The content and distribution of major elements are roughly as follows: nitrogen content in leaves is the highest, phosphorus and potassium content in flowers is the highest, and leaves and roots are the lowest.